Main Vulnerability Database Vulnerabilities #VU6697

Denial of service in Allen-Bradley MicroLogix 1100 and Allen-Bradley MicroLogix 1400 - CVE-2017-7901

Published: May 24, 2017

Vulnerability identifier: #VU6697

CSH Severity: Low

CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-7901

CWE-ID: CWE-343

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to generation of insufficiently random TCP initial sequence numbers. A remote attacker can predict the numbers from previous values and spoof or disrupt TCP connections.

Successful exploitation of the vulnerability may result in denial of service.

Affected software

Allen-Bradley MicroLogix 1100
Allen-Bradley MicroLogix 1400

How to mitigate CVE-2017-7901

Update to version 21.00

External References

https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04

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